631352378 has 4 divisors (see below), whose sum is σ = 947028570. Its totient is φ = 315676188.

The previous prime is 631352353. The next prime is 631352389. The reversal of 631352378 is 873253136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 584333929 + 47018449 = 24173^2 + 6857^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157838093 + ... + 157838096.

Almost surely, 2^631352378 is an apocalyptic number.

631352378 is a deficient number, since it is larger than the sum of its proper divisors (315676192).

631352378 is a wasteful number, since it uses less digits than its factorization.

631352378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315676191.

The product of its digits is 90720, while the sum is 38.

The square root of 631352378 is about 25126.7263685503. The cubic root of 631352378 is about 857.8748583613.

The spelling of 631352378 in words is "six hundred thirty-one million, three hundred fifty-two thousand, three hundred seventy-eight".